[A11y] RangeSlider should have 2 focus node #172729

hannah-hyj · 2025-07-24T22:14:43Z

internal: b/430179234 : in a11y mode, you can't use tab to focus on the handles of the rangeslider, only use a11y shortcut to focus on them.

rangeSlider is a widget with 1 renderObject but 2 semanticsNode because it has 2 inputs, each handle of the rangeSlider has its own actions. To achieve that, rangeSlider creates its semantics node using the assembleSemantics function.

For the same reason, rangeSlider should have 2 focus nodes instead of 1, and it should be linked to semantics to support tab to navigate in a11y mode.

This PR is to add 2 focus nodes to the range slider, link them to a11y and also highlight the thumb when focused.

Pre-launch Checklist

I read the Contributor Guide and followed the process outlined there for submitting PRs.
I read the Tree Hygiene wiki page, which explains my responsibilities.
I read and followed the Flutter Style Guide, including Features we expect every widget to implement.
I signed the CLA.
I listed at least one issue that this PR fixes in the description above.
I updated/added relevant documentation (doc comments with ///).
I added new tests to check the change I am making, or this PR is test-exempt.
I followed the breaking change policy and added Data Driven Fixes where supported.
All existing and new tests are passing.

If you need help, consider asking for advice on the #hackers-new channel on Discord.

hannah-hyj · 2025-07-28T21:41:04Z

packages/flutter/test/material/range_slider_test.dart

    expect(RendererBinding.instance.mouseTracker.debugDeviceActiveCursor(1), disabledCursor);

    await tester.pumpWidget(buildFrame(enabled: true));
-    expect(


Removing L2457-L2461 because I think this expect here was incorrect, it should never be SystemMouseCursors.none.
In previous code before my PR, if adding await tester.pumpAndSettle(); before L2457, the test will fail because it will become SystemMouseCursors.hovered.

yjbanov · 2025-07-28T22:45:04Z

packages/flutter/lib/src/material/range_slider.dart

  )
  final bool? year2023;

+  /// Focus node for the start thumb.


It would be useful to document what these focus nodes can be used for. I imagine these exist so the parent widget could programmatically control the focus? It would also be useful to document what happens if these are left as null (e.g. that a default focus node will be created).

yjbanov · 2025-07-28T22:45:11Z

packages/flutter/lib/src/material/range_slider.dart

+  /// Focus node for the start thumb.
+  final FocusNode? startFocusNode;
+
+  /// Focus node for the end thumb.


yjbanov · 2025-07-28T23:01:48Z

packages/flutter/lib/src/material/range_slider.dart

+        Row(
+          children: <Widget>[
+            Focus(focusNode: startFocusNode, child: const SizedBox.shrink()),
+            Focus(focusNode: endFocusNode, child: const SizedBox.shrink()),


This might be good enough for keyboard-based focus traversal. However, this may not be enough for mouse-based focus traversal. On the web it is expected that if I click on a thumb it acquires focus. So if I use the left/right arrow keys, the last thumb I clicked on reacts to the key.

One way to fix this is to position and size the children exactly to cover the thumbs, and hook up a click/tap listener that calls startFocusNode.requestFocus() or endFocusNode.requestFocus(), as appropriate.

That said, we can also treat it as a separate issue, and fix keyboard first, and mouse later.

sounds good, i will treat it as a separate issue

do we have code to handle adjusting the slider with keyboard once the new focus nodes receive focus?

good catch, we currently don't, we can adjust the slider in a11y mode. But when a11y mode is off, I didn't add the shortcut to the new focus nodes.

yjbanov · 2025-07-28T23:02:38Z

packages/flutter/lib/src/material/range_slider.dart

-      child: result,
+    return Stack(
+      children: <Widget>[
+        //Adds two invisible focus nodes to the range slider for its two thumbs.


nit: add one space between // and Adds.

chunhtai · 2025-07-30T16:02:30Z

packages/flutter/lib/src/material/range_slider.dart

      'This feature was deprecated after v3.30.0-0.1.pre.',
    )
    this.year2023,
+    this.startFocusNode,


Do we need to accept a focus node? Is there a use case where someone would want to pass in the focus node?

I was trying to follow the practice of Slider and it has passed-in focus node.
I removed passed-in focus nodes and if they're needed in the future they can still be added.

chunhtai · 2025-07-30T16:03:33Z

packages/flutter/lib/src/material/range_slider.dart

    enableController.dispose();
    startPositionController.dispose();
    endPositionController.dispose();
+    startFocusNode.dispose();


This can be passed-in focus node, in that case, we shouldn't dispose it

removed passed-in focus node

chunhtai · 2025-07-30T16:05:01Z

packages/flutter/lib/src/material/range_slider.dart

      } else {
        enableController.reverse();
      }
+      setState(() {


won't this crash in didUpdateWidget?

yeah you're right this should be simply "_showHoverHighlight = _hovering && isEnabled;"

chunhtai · 2025-07-30T16:05:17Z

packages/flutter/lib/src/material/range_slider.dart

        enableController.reverse();
      }
+      setState(() {
+        if (_showHoverHighlight != (_hovering && isEnabled)) {


this if check is redundant

chunhtai · 2025-07-30T16:14:54Z

packages/flutter/lib/src/material/range_slider.dart

+        Row(
+          children: <Widget>[
+            Focus(focusNode: startFocusNode, child: const SizedBox.shrink()),
+            Focus(focusNode: endFocusNode, child: const SizedBox.shrink()),


do we have code to handle adjusting the slider with keyboard once the new focus nodes receive focus?

fix tests add highlight Update range_slider.dart

…r#172729)

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internal: b/430179234 : in a11y mode, you can't use tab to focus on the handles of the rangeslider, only use a11y shortcut to focus on them. rangeSlider is a widget with 1 renderObject but 2 semanticsNode because it has 2 inputs, each handle of the rangeSlider has its own actions. To achieve that, rangeSlider creates its semantics node using the assembleSemantics function. For the same reason, rangeSlider should have 2 focus nodes instead of 1, and it should be linked to semantics to support tab to navigate in a11y mode. This PR is to add 2 focus nodes to the range slider, link them to a11y and also highlight the thumb when focused. ## Pre-launch Checklist - [ ] I read the [Contributor Guide] and followed the process outlined there for submitting PRs. - [ ] I read the [Tree Hygiene] wiki page, which explains my responsibilities. - [ ] I read and followed the [Flutter Style Guide], including [Features we expect every widget to implement]. - [ ] I signed the [CLA]. - [ ] I listed at least one issue that this PR fixes in the description above. - [ ] I updated/added relevant documentation (doc comments with `///`). - [ ] I added new tests to check the change I am making, or this PR is [test-exempt]. - [ ] I followed the [breaking change policy] and added [Data Driven Fixes] where supported. - [ ] All existing and new tests are passing. If you need help, consider asking for advice on the #hackers-new channel on [Discord].  [Contributor Guide]: https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#overview [Tree Hygiene]: https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md [test-exempt]: https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#tests [Flutter Style Guide]: https://github.com/flutter/flutter/blob/main/docs/contributing/Style-guide-for-Flutter-repo.md [Features we expect every widget to implement]: https://github.com/flutter/flutter/blob/main/docs/contributing/Style-guide-for-Flutter-repo.md#features-we-expect-every-widget-to-implement [CLA]: https://cla.developers.google.com/ [flutter/tests]: https://github.com/flutter/tests [breaking change policy]: https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#handling-breaking-changes [Discord]: https://github.com/flutter/flutter/blob/main/docs/contributing/Chat.md [Data Driven Fixes]: https://github.com/flutter/flutter/blob/main/docs/contributing/Data-driven-Fixes.md

…r#172729)

internal: b/430179234 : in a11y mode, you can't use tab to focus on the handles of the rangeslider, only use a11y shortcut to focus on them. rangeSlider is a widget with 1 renderObject but 2 semanticsNode because it has 2 inputs, each handle of the rangeSlider has its own actions. To achieve that, rangeSlider creates its semantics node using the assembleSemantics function. For the same reason, rangeSlider should have 2 focus nodes instead of 1, and it should be linked to semantics to support tab to navigate in a11y mode. This PR is to add 2 focus nodes to the range slider, link them to a11y and also highlight the thumb when focused. ## Pre-launch Checklist - [ ] I read the [Contributor Guide] and followed the process outlined there for submitting PRs. - [ ] I read the [Tree Hygiene] wiki page, which explains my responsibilities. - [ ] I read and followed the [Flutter Style Guide], including [Features we expect every widget to implement]. - [ ] I signed the [CLA]. - [ ] I listed at least one issue that this PR fixes in the description above. - [ ] I updated/added relevant documentation (doc comments with `///`). - [ ] I added new tests to check the change I am making, or this PR is [test-exempt]. - [ ] I followed the [breaking change policy] and added [Data Driven Fixes] where supported. - [ ] All existing and new tests are passing. If you need help, consider asking for advice on the #hackers-new channel on [Discord].  [Contributor Guide]: https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#overview [Tree Hygiene]: https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md [test-exempt]: https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#tests [Flutter Style Guide]: https://github.com/flutter/flutter/blob/main/docs/contributing/Style-guide-for-Flutter-repo.md [Features we expect every widget to implement]: https://github.com/flutter/flutter/blob/main/docs/contributing/Style-guide-for-Flutter-repo.md#features-we-expect-every-widget-to-implement [CLA]: https://cla.developers.google.com/ [flutter/tests]: https://github.com/flutter/tests [breaking change policy]: https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#handling-breaking-changes [Discord]: https://github.com/flutter/flutter/blob/main/docs/contributing/Chat.md [Data Driven Fixes]: https://github.com/flutter/flutter/blob/main/docs/contributing/Data-driven-Fixes.md

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github-actions bot added framework flutter/packages/flutter repository. See also f: labels. f: material design flutter/packages/flutter/material repository. labels Jul 24, 2025

hannah-hyj force-pushed the rangeslider branch from 9b154fa to 300d2ea Compare July 24, 2025 23:36

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hannah-hyj changed the title ~~[draft] range slider should have 2 focus node~~ range slider should have 2 focus node Jul 28, 2025

hannah-hyj changed the title ~~range slider should have 2 focus node~~ [A11y] RangeSlider should have 2 focus node Jul 28, 2025

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hannah-hyj added 10 commits July 31, 2025 17:41

range slider focus

ec60b20

fix tests add highlight Update range_slider.dart

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includeSemantics: false

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[a11y] RangeSlider keyboard focus does not follow mouse interaction #173575

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[Google3 Bug]: [Accessibility] RangeSlider does not respond to keyboard focus or interactions #170177

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hannah-hyj commented Jul 24, 2025 •

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